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Smoothed SDSS image of RGG 118, home of the smallest black hole ever observed in a galactic nucleus. The inset shows the Chandra identification of an x-ray source at the center. Credit: Baldassare et al. 2015
A team of astronomers have reported the detection of the smallest black hole (BH) ever observed in a galactic nucleus. The BH is hosted in the center of dwarf galaxy RGG 118, and it weighs in at 50,000 solar masses, according to observations made by Vivienne Baldassare of University of Michigan and her collaborators.

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